Patients mainly present with cognitive dysfunction, psychiatric behavioral abnormalities, and seizures of acute or subacute onset, i.e., short-term dementia, memory loss, personality changes, delusions, babbling, and recurrent convulsions; some patients may have prodromal symptoms such as fever and headache before the onset of the disease; some antibody-mediated encephalitis may also cause patients to develop sleep disorders that manifest as disturbed sleep cycles, such as Some patients may have prodromal symptoms such as fever and headache before the onset of the disease.